Analog Devices Inc./Maxim Integrated MAX6307UK49D3-T

Overview

MAX6307UK49D3-T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set 4.9V threshold), an adjustable undervoltage input (RST IN), and an adjustable overvoltage input (OVRST IN) to assert reset during power faults. It features 140ms minimum reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. Used in multivoltage embedded systems for reliable power-on and brownout protection.

For engineers reviewing the MAX6307UK49D3-T datasheet, MAX6307UK49D3-T pinout, MAX6307UK49D3-T application, or MAX6307UK49D3-T equivalent, key selection criteria include factory-trimmed 4.9V VCC threshold accuracy (±2.5% over -40°C to +85°C), dual adjustable comparator inputs, SOT23-5 package compatibility, and immunity to fast VCC transients up to 280µs at 100mV overdrive.

Technical Context

The MAX6307UK49D3-T implements a triple-monitor architecture: internal factory-trimmed resistor divider sets nominal 4.9V VCC reset threshold; external resistor dividers program RST IN (undervoltage) and OVRST IN (overvoltage) thresholds referenced to 1.23V internal bandgap. All three comparators feed a shared reset generator with 140ms minimum timeout.

Its open-drain active-low RESET output operates across VCC = 1.0V to 5.5V, sinking ≥3.2mA at VCC > 4.25V. The device ignores transients ≤280µs on any monitored input when overdriven by 100mV - a critical feature for noisy power rails in portable and industrial equipment.

Key Specifications

Pinout & Package

MAX6307UK49D3-T is housed in a 5-pin SOT23-5 package (outline U5+1, land pattern 90-0174), optimized for space-constrained PCB layouts in portable and embedded applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory IC applications.

Compared with MAX6307UK49D2-T and TPS3808G33DBVR, the MAX6307UK49D3-T uniquely combines factory-trimmed 4.9V VCC supervision, dual adjustable inputs (RST IN/OVRST IN), and 140ms timeout in SOT23-5 - making it the only option among the three capable of comprehensive 5V-system fault coverage including overvoltage protection.

Availability

MAX6307UK49D3-T is available at Aetrix Electronics and suitable for portable computers, industrial PLCs, and automotive body control modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MAX6307UK49D3-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.

The MAX6305–MAX6313 family was designed specifically for multivoltage microprocessor supervision in space-constrained, low-power systems - emphasizing precision thresholding, transient immunity, and minimal external component count.

FAQ

What is the exact factory-programmed VCC reset threshold for MAX6307UK49D3-T?

The MAX6307UK49D3-T has a factory-trimmed VCC reset threshold of 4.900V nominal, with ±2.5% tolerance over the full operating temperature range (-40°C to +85°C). This value is confirmed in Table 1 of the datasheet and corresponds to the "49" in the part number. The actual measured threshold for a given unit falls between 4.778V and 5.023V at room temperature, and between 4.730V and 5.070V across temperature extremes.

Does MAX6307UK49D3-T support overvoltage detection, and how is it implemented?

Yes, MAX6307UK49D3-T supports overvoltage detection via its dedicated OVRST IN pin (Pin 4). This input compares an externally divided voltage to the internal 1.23V reference - when the divided voltage exceeds 1.23V, the device asserts RESET. Unlike VCC monitoring, OVRST IN is fully adjustable and immune to transients up to 280µs at 100mV overdrive, enabling reliable surge detection on auxiliary rails like 12V or 24V systems.

What is the guaranteed minimum reset timeout period for MAX6307UK49D3-T?

The MAX6307UK49D3-T guarantees a minimum reset timeout period of 140ms, as indicated by the "D3" suffix in the part number. This value is production-tested and specified across temperature and voltage ranges (VCC = 1.0V to 5.5V, TA = -40°C to +85°C). The typical timeout is 200ms, and maximum is 280ms - providing design margin for µP power-up sequencing compliance.

Can MAX6307UK49D3-T operate reliably during deep brownout conditions?

Yes, MAX6307UK49D3-T guarantees functional RESET assertion down to VCC = 1.0V, as verified in the Electrical Characteristics table. Its open-drain RESET output remains valid (capable of sinking ≥500µA) even at this level, preventing µP execution errors during severe undervoltage events. Below 1.0V, operation is not specified - consistent with most microprocessor reset requirements.

Is MAX6307UK49D3-T compatible with lead-free PCB assembly processes?

Yes, MAX6307UK49D3-T is available in lead-free packaging. The "-T" suffix denotes tape-and-reel packaging with RoHS-compliant, lead-free terminations. For reflow soldering, the device supports peak temperatures up to +260°C (per JEDEC J-STD-020), matching standard lead-free process profiles. No special handling or derating is required beyond standard SOT23 thermal guidelines.